-79.19% is the change from 817 to 170
Calculation steps:
[( 170 - 817 ) ÷ 817] x 100 = -79.19%
Formula
Percentage change = [(170 - 817) / 817] x 100
Subtract the new number by the original number
170 - 817 = -647
-647 ÷ 817 = -0.791921664626683
-0.791921664626683 x 100 = -79.19%